package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author : jiang
 * @date : 2023/10/27 9:04
 */
@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计营业额
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        ArrayList<LocalDate> dates = getLocalDates(begin, end);

        ArrayList<Double> turnoverList = new ArrayList<>();
        //获取集合中每一天的最早和最晚时间
        for (LocalDate date : dates) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            //构造map 装每一天的开始时间和结束时间和需要统计的订单的状态
            Map<String, Object> map = new HashMap<>(16);
            map.put("begin",beginTime);
            map.put("end",endTime);
            //已完成的订单
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);
            if (turnover == null){
                turnover = 0.0;
            }
            turnoverList.add(turnover);
        }

        //封装数据返回
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dates,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 构造时间集合
     * @param begin
     * @param end
     * @return
     */
    private ArrayList<LocalDate> getLocalDates(LocalDate begin, LocalDate end) {
        ArrayList<LocalDate> dates = new ArrayList<>();
        dates.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dates.add(begin);
        }
        return dates;
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        ArrayList<LocalDate> dates = getLocalDates(begin, end);
        //新增用户数
        ArrayList<Integer> newUserList = new ArrayList<>();
        //总用户数
        ArrayList<Integer> totalUserList = new ArrayList<>();

        Map<String, Object> map = new HashMap<>(16);
        for (LocalDate date : dates) {
            map.put("begin",null);
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            map.put("end",endTime);
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dates,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //构建时间集合
        ArrayList<LocalDate> dates = getLocalDates(begin, end);

        //每天订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        //每天有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dates) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            //每天有效订单
            Integer orderCount = orderMapper.getOrderCount(beginTime,endTime,Orders.COMPLETED);
            //每天总订单
            Integer totalOrderCount = orderMapper.getOrderCount(beginTime,endTime,null);

            orderCountList.add(totalOrderCount);
            validOrderCountList.add(orderCount);
        }

        //指定时间区间内的订单总数
        Integer totalOrders = orderCountList.stream().reduce(Integer::sum).get();
        //指定时间区间内的有效订单数
        Integer validOrders = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orders = 0.0;
        if (totalOrders != 0){
            orders = validOrders.doubleValue() / totalOrders;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dates,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .orderCompletionRate(orders)
                .validOrderCount(validOrders)
                .totalOrderCount(totalOrders)
                .build();
    }

    /**
     * 统计菜品销量前十
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getDishTop10(LocalDate begin, LocalDate end) {
        //获取时间区间的最早和最晚时间
        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getDishTop10(beginTime,endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()),",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()),",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        //查询概览运营数据，提供给Excel模板文件
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN),LocalDateTime.of(end,LocalTime.MAX));

        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于提供好的模板文件创建一个新的Excel表格对象
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            //获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();

        }catch (IOException e){
            e.printStackTrace();
        }
    }

}
